main.c

/* Copyright (c) 2016 ioStation Ltd. All Rights Reserved.
 *
 * Licensees are granted free, non-transferable use of the information. NO
 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
 * the file.
 *
 */


#include <stdio.h>
#include <string.h>
#include "SEGGER_RTT.h"
#include "SEGGER_RTT_Conf.h"
#include "nordic_common.h"
#include "nrf.h"
#include "app_util_platform.h"
#include "app_error.h"
#include "app_uart.h"
#include "app_timer.h"
#include "app_button.h"
#include "nrf_drv_i2s.h"
#include "nrf_drv_uart.h"
#include "nrf_delay.h"
#include "nrf_drv_timer.h"
#include "boards.h"
#include "bsp.h"
#include "bsp_btn_ble.h"

#include "ble_advdata.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "ble_conn_state.h"
#include "ble_gap.h"
#include "ble.h"
#include "ble_hci.h"
#include "ble_lbs.h"
#include "ble_srv_common.h"
#include "ble_bas.h"
#include "ble_dis.h"
#include "peer_manager.h"
#include "fds.h"
#include "fstorage.h"
#include "softdevice_handler.h"

#define NRF_LOG_MODULE_NAME "APP"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"

#include "config.h"
#include "common.h"
#include "ws2812b_drive.h"
#include "i2s_ws2812b_drive.h"
#include "rainbow.h"
#include "ble_service.h"


// For LED indicators
#define GOODLED     BSP_LED_0_MASK
#define BLANKLED	BSP_LED_1_MASK
#define BADLED      BSP_LED_2_MASK

static bool         m_is_notifying_enabled = false;             /**< Variable to indicate whether the notification is enabled by the peer.*/
static uint16_t     m_conn_handle = BLE_CONN_HANDLE_INVALID;    /**< Handle of the current connection. */
//static ble_lbs_t                        m_lbs;                /**< LED Button Service instance. */
static ble_os_t     m_our_service;                              /**< BLE Services */
APP_TIMER_DEF(m_app_char_timer_id);
APP_TIMER_DEF(m_app_adv_timer_id);

bool m_is_advertising = false;
bool m_color_changed = false;
static ble_uuid_t m_uuid_type;
static uint32_t m_rgb_color=0;


void app_error_fault_handler(uint32_t id, uint32_t pc, uint32_t info)
{
    #ifdef DEBUG
    app_error_print(id, pc, info);
    #endif

    LEDS_ON(LEDS_MASK);
    while(1);
}

/**@brief Function for assert macro callback.
 *
 * @details This function will be called in case of an assert in the SoftDevice.
 *
 * @warning This handler is an example only and does not fit a final product. You need to analyze
 *          how your product is supposed to react in case of Assert.
 * @warning On assert from the SoftDevice, the system can only recover on reset.
 *
 * @param[in] line_num    Line number of the failing ASSERT call.
 * @param[in] p_file_name File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
    app_error_handler(DEAD_BEEF, line_num, p_file_name);
}

/** Event responses and dispatchers
 *
 */


/**@brief Function for dispatching a system event to interested modules.
 *
 * @details This function is called from the System event interrupt handler after a system
 *          event has been received.
 *
 * @param[in] sys_evt  System stack event.
 */
static void sys_evt_dispatch(uint32_t sys_evt)
{
    // Dispatch the system event to the fstorage module, where it will be
    // dispatched to the Flash Data Storage (FDS) module.
    fs_sys_event_handler(sys_evt);

    // Dispatch to the Advertising module last, since it will check if there are any
    // pending flash operations in fstorage. Let fstorage process system events first,
    // so that it can report correctly to the Advertising module.
    ble_advertising_on_sys_evt(sys_evt);
}

/**@brief Function for dispatching a BLE stack event to all modules with a BLE stack event handler.
 *
 * @details This function is called from the scheduler in the main loop after a BLE stack
 *          event has been received.
 *
 * @param[in] p_ble_evt  Bluetooth stack event.
 */
static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
    on_ble_evt(p_ble_evt);
//    ble_bas_on_ble_evt(&m_bas, p_ble_evt);
    ble_conn_params_on_ble_evt(p_ble_evt);
    ble_our_service_on_ble_evt(&m_our_service, p_ble_evt);
    ble_conn_state_on_ble_evt(p_ble_evt);
    pm_on_ble_evt(p_ble_evt);
    ble_advertising_on_ble_evt(p_ble_evt);

}

/**@brief Function for handling advertising events.
 *
 * @details This function will be called for advertising events which are passed to the application.
 *
 * @param[in] ble_adv_evt  Advertising event.
 */
static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
    uint32_t err_code;

    switch (ble_adv_evt)
    {
        case BLE_ADV_EVT_FAST:
            err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_ADV_EVT_IDLE:
            power_manage();

            break;

        default:
            break;
    }
}

/**@brief Function for handling the Connection Parameters Module.
 *
 * @details This function will be called for all events in the Connection Parameters Module that
 *          are passed to the application.
 *
 * @note All this function does is to disconnect. This could have been done by simply
 *       setting the disconnect_on_fail config parameter, but instead we use the event
 *       handler mechanism to demonstrate its use.
 *
 * @param[in] p_evt  Event received from the Connection Parameters Module.
 */
static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
    uint32_t err_code;

    if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
    {
        application_timers_stop();  // stop application timers when it is about to disconnect (#5)
        err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
        APP_ERROR_CHECK(err_code);
    }
}

/**@brief Function for handling the Application's BLE stack events.
 *
 * @param[in] p_ble_evt  Bluetooth stack event.
 */
static void on_ble_evt(ble_evt_t * p_ble_evt)
{
    uint32_t err_code;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            LEDS_ON(CONNECTED_LED_PIN);
            LEDS_OFF(ADVERTISING_LED_PIN);
            m_is_advertising = false;
            adv_led_timer_stop();
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            application_timers_start();
            err_code = app_button_enable();
            APP_ERROR_CHECK(err_code);
            break; // BLE_GAP_EVT_CONNECTED

        case BLE_GAP_EVT_DISCONNECTED:
            application_timers_stop();  // Stop application timer when disconnected (#5)
            LEDS_OFF(CONNECTED_LED_PIN);
            m_conn_handle = BLE_CONN_HANDLE_INVALID;

            err_code = app_button_disable();
            APP_ERROR_CHECK(err_code);

            advertising_start();
            break; // BLE_GAP_EVT_DISCONNECTED

        case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
            // Pairing not supported
            err_code = sd_ble_gap_sec_params_reply(m_conn_handle,
                                                   BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP,
                                                   NULL,
                                                   NULL);
            APP_ERROR_CHECK(err_code);
            break; // BLE_GAP_EVT_SEC_PARAMS_REQUEST

        case BLE_GATTS_EVT_SYS_ATTR_MISSING:
            // No system attributes have been stored.
            err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
            APP_ERROR_CHECK(err_code);
            break; // BLE_GATTS_EVT_SYS_ATTR_MISSING

        case BLE_GATTC_EVT_TIMEOUT:
            // Disconnect on GATT Client timeout event.
            err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,
                                             BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            APP_ERROR_CHECK(err_code);
            break; // BLE_GATTC_EVT_TIMEOUT

        case BLE_GATTS_EVT_TIMEOUT:
            // Disconnect on GATT Server timeout event.
            err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
                                             BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            APP_ERROR_CHECK(err_code);
            break; // BLE_GATTS_EVT_TIMEOUT

        case BLE_GATTS_EVT_WRITE:
            on_write(p_ble_evt);
            break; // BLE_GATTS_EVT_WRITE

        case BLE_EVT_USER_MEM_REQUEST:
            err_code = sd_ble_user_mem_reply(p_ble_evt->evt.gattc_evt.conn_handle, NULL);
            APP_ERROR_CHECK(err_code);
            break; // BLE_EVT_USER_MEM_REQUEST

        case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:
        {
            ble_gatts_evt_rw_authorize_request_t  req;
            ble_gatts_rw_authorize_reply_params_t auth_reply;

            req = p_ble_evt->evt.gatts_evt.params.authorize_request;

            if (req.type != BLE_GATTS_AUTHORIZE_TYPE_INVALID)
            {
                if ((req.request.write.op == BLE_GATTS_OP_PREP_WRITE_REQ)     ||
                    (req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_NOW) ||
                    (req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_CANCEL))
                {
                    if (req.type == BLE_GATTS_AUTHORIZE_TYPE_WRITE)
                    {
                        auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_WRITE;
                    }
                    else
                    {
                        auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_READ;
                    }
                    auth_reply.params.write.gatt_status = APP_FEATURE_NOT_SUPPORTED;
                    err_code = sd_ble_gatts_rw_authorize_reply(p_ble_evt->evt.gatts_evt.conn_handle,
                                                               &auth_reply);
                    APP_ERROR_CHECK(err_code);
                }
            }
        } break; // BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST

#if (NRF_SD_BLE_API_VERSION == 3)
        case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
            err_code = sd_ble_gatts_exchange_mtu_reply(p_ble_evt->evt.gatts_evt.conn_handle,
                                                       NRF_BLE_MAX_MTU_SIZE);
            APP_ERROR_CHECK(err_code);
            break; // BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST
#endif

        default:
            // No implementation needed.
            break;
    }
}

/** Various handlers
 * Handle various events interruptions
 */


/**@brief Function for evaluating the value written in CCCD
 *
 * @details This shall be called when there is a write event received from the stack. This
 *          function will evaluate whether or not the peer has enabled notifications and
 *          start/stop notifications accordingly.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 */
static void on_write(ble_evt_t * p_ble_evt)
{
    ble_gatts_evt_write_t * p_evt_write = &p_ble_evt->evt.gatts_evt.params.write;

    if ((p_evt_write->handle == m_our_service.char_handles.cccd_handle) && (p_evt_write->len == 2))
    {
        // CCCD written. Start notifications
        m_is_notifying_enabled = ble_srv_is_notification_enabled(p_evt_write->data);
    }

    if ((p_evt_write->handle == m_our_service.char_handles.value_handle) && (p_evt_write->len == 4))
    {
        // Update RGB LED value
        m_rgb_color = p_evt_write->data[3]<<24 | p_evt_write->data[2]<<16 | p_evt_write->data[1]<<8 | p_evt_write->data[0];
        m_color_changed = true;
    }
}

/**@brief Function for handling a Connection Parameters error.
 *
 * @param[in] nrf_error  Error code containing information about what went wrong.
 */
static void conn_params_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}

/**@brief Function for handling events from the button handler module.
 *
 * @param[in] pin_no        The pin that the event applies to.
 * @param[in] button_action The button action (press/release).
 */
static void button_event_handler(uint8_t pin_no, uint8_t button_action)
{
//    uint32_t err_code;

    switch (pin_no)
    {
        case LEDBUTTON_BUTTON_PIN:
/*
            err_code = ble_lbs_on_button_change(&m_lbs, button_action);
            if (err_code != NRF_SUCCESS &&
                err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
                err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
*/
            break;

        default:
            APP_ERROR_HANDLER(pin_no);
            break;
    }
}


/**@brief Function for handling File Data Storage events.
 *
 * @param[in] p_evt  Peer Manager event.
 * @param[in] cmd
 */
static void fds_evt_handler(fds_evt_t const * p_evt)
{
    if (p_evt->id == FDS_EVT_GC)
    {
    }
}


/**@brief Function for handling Peer Manager events.
 *
 * @param[in] p_evt  Peer Manager event.
 */
static void pm_evt_handler(pm_evt_t const * p_evt)
{
    ret_code_t err_code;

    switch (p_evt->evt_id)
    {
        case PM_EVT_BONDED_PEER_CONNECTED:
            err_code = pm_peer_rank_highest(p_evt->peer_id);
            if (err_code != NRF_ERROR_BUSY)
            {
                APP_ERROR_CHECK(err_code);
            }
            break; // PM_EVT_BONDED_PEER_CONNECTED

        case PM_EVT_CONN_SEC_START:
            break; // PM_EVT_CONN_SEC_START

        case PM_EVT_CONN_SEC_SUCCEEDED:
//            NRF_LOG_DEBUG("Link secured. Role: %d. conn_handle: %d, Procedure: %d\r\n",
//                                 ble_conn_state_role(p_evt->conn_handle),
//                                 p_evt->conn_handle,
//                                 p_evt->params.conn_sec_succeeded.procedure);
            err_code = pm_peer_rank_highest(p_evt->peer_id);
            if (err_code != NRF_ERROR_BUSY)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;  // PM_EVT_CONN_SEC_SUCCEEDED

        case PM_EVT_CONN_SEC_FAILED:

            /** In some cases, when securing fails, it can be restarted directly. Sometimes it can
             *  be restarted, but only after changing some Security Parameters. Sometimes, it cannot
             *  be restarted until the link is disconnected and reconnected. Sometimes it is
             *  impossible, to secure the link, or the peer device does not support it. How to
             *  handle this error is highly application dependent. */
            switch (p_evt->params.conn_sec_failed.error)
            {
                case PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING:
                    // Rebond if one party has lost its keys.
                    err_code = pm_conn_secure(p_evt->conn_handle, true);
                    if (err_code != NRF_ERROR_INVALID_STATE)
                    {
                        APP_ERROR_CHECK(err_code);
                    }
                    break;

                default:
                    break;
            }
            break; // PM_EVT_CONN_SEC_FAILED

        case PM_EVT_CONN_SEC_CONFIG_REQ:
        {
            // Reject pairing request from an already bonded peer.
            pm_conn_sec_config_t conn_sec_config = {.allow_repairing = false};
            pm_conn_sec_config_reply(p_evt->conn_handle, &conn_sec_config);
        } break; // PM_EVT_CONN_SEC_CONFIG_REQ

        case PM_EVT_STORAGE_FULL:
            // Run garbage collection on the flash.
            err_code = fds_gc();
            if (err_code != NRF_ERROR_BUSY)
            {
                APP_ERROR_CHECK(err_code);
            }
            break; // PM_EVT_STORAGE_FULL

        case PM_EVT_ERROR_UNEXPECTED:
            // A likely fatal error occurred. Assert.
            APP_ERROR_CHECK(p_evt->params.error_unexpected.error);
            break;

        case PM_EVT_PEER_DATA_UPDATE_SUCCEEDED:
            break; // PM_EVT_PEER_DATA_UPDATE_SUCCEEDED

        case PM_EVT_PEER_DATA_UPDATE_FAILED:
            // Assert.
            APP_ERROR_CHECK_BOOL(false);
            break; // PM_EVT_ERROR_UNEXPECTED

        case PM_EVT_PEER_DELETE_SUCCEEDED:
            break; // PM_EVT_PEER_DELETE_SUCCEEDED

        case PM_EVT_PEER_DELETE_FAILED:
            // Assert.
            APP_ERROR_CHECK(p_evt->params.peer_delete_failed.error);
            break; // PM_EVT_PEER_DELETE_FAILED

        case PM_EVT_PEERS_DELETE_SUCCEEDED:
            advertising_start();
            break; // PM_EVT_PEERS_DELETE_SUCCEEDED

        case PM_EVT_PEERS_DELETE_FAILED:
            // Assert.
            APP_ERROR_CHECK(p_evt->params.peers_delete_failed_evt.error);
            break; // PM_EVT_PEERS_DELETE_FAILED

        case PM_EVT_LOCAL_DB_CACHE_APPLIED:
            break; // PM_EVT_LOCAL_DB_CACHE_APPLIED

        case PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED:
            // The local database has likely changed, send service changed indications.
            pm_local_database_has_changed();
            break; // PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED

        case PM_EVT_SERVICE_CHANGED_IND_SENT:
            break; // PM_EVT_SERVICE_CHANGED_IND_SENT

        case PM_EVT_SERVICE_CHANGED_IND_CONFIRMED:
            break; // PM_EVT_SERVICE_CHANGED_IND_SENT

        default:
            // No implementation needed.
            break;
    }
}

/** Functions handling timer timeout events
 */

/**@brief Function for handling the app timer timeout.
 *
 * @details This function will be called each time the app timer expires.
 *
 * @param[in] p_context   Pointer used for passing some arbitrary information (context) from the
 *                        app_start_timer() call to the timeout handler.
 */
static void app_timeout_handler(void * p_context)
{
    UNUSED_PARAMETER(p_context);

}


/**@brief Function for handling onboard LED event
 *
 * @details This function is called from the board event interrupt handler
 *
 * @param[in] void none
 */

static void led_handler()
{
    if (m_is_advertising) {
        LEDS_INVERT(ADVERTISING_LED_PIN);
    } else {
        LEDS_OFF(ADVERTISING_LED_PIN);
    }
}

/** Init functions
 * Intialize various things
 */

/**@brief Function for initializing the button handler module.
 */
static void buttons_init(void)
{
    uint32_t err_code;

    //The array must be static because a pointer to it will be saved in the button handler module.
    static app_button_cfg_t buttons[] =
    {
        {LEDBUTTON_BUTTON_PIN, false, BUTTON_PULL, button_event_handler}
    };

    err_code = app_button_init(buttons, sizeof(buttons) / sizeof(buttons[0]),
                               BUTTON_DETECTION_DELAY);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for the LEDs initialization.
 *
 * @details Initializes all LEDs used by the application.
 */
static void leds_init(void)
{
    LEDS_CONFIGURE(ADVERTISING_LED_PIN | CONNECTED_LED_PIN | LEDBUTTON_LED_PIN | CPU_LED_PIN);
    LEDS_OFF(ADVERTISING_LED_PIN | CONNECTED_LED_PIN | LEDBUTTON_LED_PIN);
    LEDS_ON(CPU_LED_PIN);    // LED on when CPU is on
}

/**@brief Function for the Timer initialization.
 *
 * @details Initializes the timer module.
 */

static void timers_init(void)
{
    uint32_t                err_code;

    // Initialize timer module, making it use the scheduler
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
    // Create timers.
    err_code = app_timer_create(&m_app_char_timer_id,
                                APP_TIMER_MODE_REPEATED,
                                app_timeout_handler);
    err_code = app_timer_create(&m_app_adv_timer_id,
                                APP_TIMER_MODE_REPEATED,
                                led_handler);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for initializing the BLE stack.
 *
 * @details Initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    uint32_t err_code;

    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

    // Initialize the SoftDevice handler module.
    SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

    ble_enable_params_t ble_enable_params;
    err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
                                                    PERIPHERAL_LINK_COUNT,
                                                    &ble_enable_params);
    APP_ERROR_CHECK(err_code);

    //Check the ram settings against the used number of links
    CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT, PERIPHERAL_LINK_COUNT);

    // Enable BLE stack.
#if (NRF_SD_BLE_API_VERSION == 3)
    ble_enable_params.gatt_enable_params.att_mtu = NRF_BLE_MAX_MTU_SIZE;
#endif
    err_code = softdevice_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);

    // Subscribe for BLE events.
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);

    // Register with the SoftDevice handler module for BLE events.
    err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for initializing the Advertising functionality.
 *
 * @details Encodes the required advertising data and passes it to the stack.
 *          Also builds a structure to be passed to the stack when starting advertising.
 */
static void advertising_init(void)
{
    uint32_t      err_code;
    ble_advdata_t advdata;
    ble_advdata_t scanrsp;
    ble_adv_modes_config_t options;

    SEGGER_RTT_WriteString(0, "DEBUG: BLE Advertising Init!\n");
    ble_uuid_t more_adv_uuids[] = {{BLE_UUID_OUR_SERVICE_UUID, BLE_UUID_TYPE_BLE},
                                   {BLE_UUID_DEVICE_INFORMATION_SERVICE, BLE_UUID_TYPE_BLE}};

    // Build and set advertising data
    memset(&advdata, 0, sizeof(advdata));

    advdata.name_type          = BLE_ADVDATA_SHORT_NAME;
    advdata.short_name_len = 7; // Advertise only first 6 letters of name
    advdata.include_appearance = true;
    advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;

    memset(&scanrsp, 0, sizeof(scanrsp));
    scanrsp.name_type               = BLE_ADVDATA_NO_NAME; 
    scanrsp.uuids_complete.uuid_cnt = sizeof(more_adv_uuids) / sizeof(more_adv_uuids[0]);
    scanrsp.uuids_complete.p_uuids  = more_adv_uuids;

    memset(&options, 0, sizeof(options));
    options.ble_adv_fast_enabled  = false;

    err_code = ble_advertising_init(&advdata, &scanrsp, &options, on_adv_evt, NULL);
//    err_code = ble_advdata_set(&advdata, &scanrsp);   // works equally well
    m_is_advertising = false;

    APP_ERROR_CHECK(err_code);
}

/**@brief Function for the GAP initialization.
 *
 * @details This function sets up all the necessary GAP (Generic Access Profile) parameters of the
 *          device including the device name, appearance, and the preferred connection parameters.
 */
static void gap_params_init(void)
{
    uint32_t                err_code;
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

    err_code = sd_ble_gap_device_name_set(&sec_mode,
                                          (const uint8_t *)DEVICE_NAME,
                                          strlen(DEVICE_NAME));
    APP_ERROR_CHECK(err_code);

    memset(&gap_conn_params, 0, sizeof(gap_conn_params));

    gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
    APP_ERROR_CHECK(err_code);

}


/**@brief Function for initializing the Connection Parameters module.
 */
static void conn_params_init(void)
{
    uint32_t               err_code;
    ble_conn_params_init_t cp_init;

    memset(&cp_init, 0, sizeof(cp_init));

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = false;
    cp_init.evt_handler                    = on_conn_params_evt;
    cp_init.error_handler                  = conn_params_error_handler;

    err_code = ble_conn_params_init(&cp_init);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for the Peer Manager initialization.
 *
 * @param[in] erase_bonds  Indicates whether bonding information should be cleared from
 *                         persistent storage during initialization of the Peer Manager.
 */
static void peer_manager_init(bool erase_bonds)
{
    ble_gap_sec_params_t sec_param;
    ret_code_t           err_code;

    err_code = pm_init();
    APP_ERROR_CHECK(err_code);

    if (erase_bonds)
    {
        err_code = pm_peers_delete();
        APP_ERROR_CHECK(err_code);
    }

    memset(&sec_param, 0, sizeof(ble_gap_sec_params_t));

    // Security parameters to be used for all security procedures.
    sec_param.bond           = SEC_PARAM_BOND;
    sec_param.mitm           = SEC_PARAM_MITM;
    sec_param.io_caps        = SEC_PARAM_IO_CAPABILITIES;
    sec_param.oob            = SEC_PARAM_OOB;
    sec_param.min_key_size   = SEC_PARAM_MIN_KEY_SIZE;
    sec_param.max_key_size   = SEC_PARAM_MAX_KEY_SIZE;
    sec_param.kdist_own.enc  = 1;
    sec_param.kdist_own.id   = 1;
    sec_param.kdist_peer.enc = 1;
    sec_param.kdist_peer.id  = 1;

    err_code = pm_sec_params_set(&sec_param);
    APP_ERROR_CHECK(err_code);

    err_code = pm_register(pm_evt_handler);
    APP_ERROR_CHECK(err_code);

    err_code = fds_register(fds_evt_handler);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for initializing services that will be used by the application.
 */
static void services_init(void)
{
    /* ### */
    our_service_init(&m_our_service, &m_uuid_type);    

}

/** Various timer start/stop functions
 */

 /**@brief Function for starting application timers.
 */
static void application_timers_start(void)
{
    uint32_t err_code;

    // Start application timers.
    err_code = app_timer_start(m_app_char_timer_id, LED_REFRESH_INTERVAL, NULL);
    APP_ERROR_CHECK(err_code);
}

static void  adv_led_timer_start(void)
{
    uint32_t err_code;

    err_code = app_timer_start(m_app_adv_timer_id, ADV_LED_INTERVAL, NULL);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for Stopping application timers.
 */
static void application_timers_stop(void)
{
    uint32_t err_code;

    err_code = app_timer_stop(m_app_char_timer_id);
    LEDS_OFF(LEDBUTTON_LED_PIN);
    APP_ERROR_CHECK(err_code);
}

static void  adv_led_timer_stop(void)
{
    uint32_t err_code;

    err_code = app_timer_stop(m_app_adv_timer_id);
    APP_ERROR_CHECK(err_code);
}

/** Application program functions start/stop
 */


/**@brief Function for starting advertising.
 */
static void advertising_start(void)
{
    uint32_t             err_code;
    ble_gap_adv_params_t adv_params;

    // Start advertising
    memset(&adv_params, 0, sizeof(adv_params));

    adv_params.type        = BLE_GAP_ADV_TYPE_ADV_IND;
    adv_params.p_peer_addr = NULL;
    adv_params.fp          = BLE_GAP_ADV_FP_ANY;
    adv_params.interval    = APP_ADV_INTERVAL;
    adv_params.timeout     = APP_ADV_TIMEOUT_IN_SECONDS;

    err_code = sd_ble_gap_adv_start(&adv_params);
    APP_ERROR_CHECK(err_code);
    adv_led_timer_start();
    m_is_advertising = true;
}

/** Perform rainbow
 */

static void do_rainbow(void)
{
    rgb_led_t led_array[NUM_LEDS];
    uint32_t current_limit;

    LEDS_INVERT(GOODLED);
    
    rainbow_init(NUM_LEDS);
    
    int32_t time_left = DEMO_PERIOD;
    int32_t step_time = CYCLE_TIME;
    while (time_left > 0 )
    {
        LEDS_INVERT(GOODLED);   // Beat the heart

        // work out the LED colors for each cycle 
        rainbow(led_array);

        // Adjust total current used by LEDs to below the max allowed 
        current_limit = MAX_TOTAL_CURRENT;
        ws2812b_drive_current_cap(led_array, NUM_LEDS, current_limit);

        if (i2s_ws2812b_drive_xfer(led_array, NUM_LEDS, STDOUT) != NRF_SUCCESS) {
            LEDS_ON(BADLED);    // Lit error indicator up
            SEGGER_RTT_WriteString(0,"ERROR: Send to LED failed!\n");
        } else {
            LEDS_OFF(BADLED);   // Reset bad status indicator
        }

        nrf_delay_ms(CYCLE_TIME);

        time_left -= step_time;
    }

    rainbow_uninit();
    
    // Turn off LEDs
    ws2812b_drive_set_blank(led_array,NUM_LEDS);
    i2s_ws2812b_drive_xfer(led_array, NUM_LEDS, STDOUT);
    LEDS_ON(BLANKLED);
    nrf_delay_ms(1000);
    LEDS_OFF(BLANKLED);
}

static void change_color(void)
{
    rgb_led_t led_array[NUM_LEDS];
    uint32_t current_limit;

    rainbow_init(NUM_LEDS);

    // work out the LED colors for each cycle 
    setcolor(led_array, m_rgb_color);

    // Adjust total current used by LEDs to below the max allowed 
    current_limit = MAX_TOTAL_CURRENT;
    ws2812b_drive_current_cap(led_array, NUM_LEDS, current_limit);

    if (i2s_ws2812b_drive_xfer(led_array, NUM_LEDS, STDOUT) != NRF_SUCCESS) {
        SEGGER_RTT_WriteString(0,"ERROR: Send to LED failed!\n");
    }

    rainbow_uninit();
}

/**@brief Function for the Power Manager.
 */

static void power_manage(void)
{
    uint32_t err_code = sd_app_evt_wait();

    APP_ERROR_CHECK(err_code);
}


/****************
 *   Main()
 ****************/

int main(void)
{
    ret_code_t err_code;

    // Initialize.
    err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);
    leds_init();
    timers_init();
    buttons_init();

    ble_stack_init();
    peer_manager_init(false);
    gap_params_init();
    services_init();
    advertising_init();
    conn_params_init();
    advertising_start();

    do_rainbow();

	while (1)	// repeat forever
    {
        if (m_color_changed) {
            m_color_changed = false;
            change_color();
        }
        NRF_LOG_FLUSH();
        if (NRF_LOG_PROCESS() == false)
        {
                power_manage();
        }
	}
   
}


/** @} */